How do I can use the D-Link DBT-122 ?

Why?

Allan

I ues 10.7.4 and I have D-Link DBT-122, Apple Wireless Keyboards and Magic Mouse.

I want to use it at the same time with D-Link DBT-122

You cannot use two BT transmitters/receivers on the machine at the same time. And since you never specified your machine I can't tell you if plugging the dongle in will disable or override the built in BT. I can say for sure if you use a 2010 mac pro the dongle will disable the internal BT (that's my setup but a different dongle).

Mac pro's I can see why you would want to use a dongle (because the mac pro BT $ucks). If you don't have a mac pro then why are you asking about adding a dongle?